薄膜開關

是集按鍵功能、指示元件、儀器面板為一體的一種新型電子按鍵操作系統(tǒng)。

由面板、夾層膠、上電路、隔片層、下電路和背膠層六部分組成按下薄膜開關，上電路的觸點向下變形，與下電路的極板接觸導通，手指松開后，上電路觸點反彈回來，電路斷開，回路觸發(fā)一個信號。薄膜開關結構嚴謹，外形美觀，密封性好。具有防潮濕，使用壽命長等特點。廣泛應用于電子通訊、電子測量的儀器，工業(yè)控制，醫(yī)療設備，汽車工業(yè)，智能玩具，家用電器等領域。

薄膜開關裝置中有許多種不同形式和結構的按鍵。按鍵的基本性能例如行程、操作力和機械壽命主要由按鍵類型和材料決定。薄膜開關包括單片線路開關和雙片線路開關。

通常，薄膜開關上的按鍵只是用色彩來表達鍵體的位置、形狀和大小。這樣，只能憑操作者的視覺來識別操作的準確性，由于沒有適當?shù)姆答佇畔⒈砻魇种甘欠癜丛诹碎_關的有效范圍使開關動作， 因而影響了對整機監(jiān)控的自信和操作的速度。一種使開關鍵體微微凸起，略高于面板，構成立體形狀的薄膜開關，稱為立體鍵開關。立體鍵不僅能準確地給定鍵體的范圍，提高辨認速度，使操作者的觸覺比較敏感，同時還增進了產(chǎn)品外觀的裝飾效果.開關可以按特性分為以下列出的三種主要觸覺結構：

1、金屬彈片按鍵：

金屬彈片按鍵采用成形的金屬彈片，布置在開關結構的內(nèi)部。彈片上帶有按鈕接頭，用于形成電氣回路。
優(yōu)點：(1)此結構具有良好的觸覺性能。
(2)高溫狀態(tài)下使用壽命仍舊很長。
缺點：(1)用于柔軟的面板時，若面板在凸起區(qū)域彎曲則面板可能被損壞。
(2)此結構最好用于印刷電路板或剛性面板。
2、聚脂按鍵:
聚脂按鍵是在薄膜開關結構中的線路層軋出凸起的按鍵，此結構非常耐用，行程比金屬彈片按鍵要小一些。在一些應用中，聚脂按鍵可以被軋到面膜層，此種方式可以減少薄膜開關的總層數(shù)。按鍵的操作力與材料厚度、按鍵直徑和按鍵凸起高度有關。
優(yōu)點：(1)非常耐用
 (2)可以很好地使用數(shù)百萬次
3、無感按鍵:
無手感開關沒有觸感，此種操作面板通常采用其它方式表示開關的動作狀態(tài)。
優(yōu)點：(1)使用壽命長(可以使用上百萬次)。
(2)有效面積大。 

(3)在所有的開關形式中價格最低點擊放大

缺點：(1)沒有手感。

 (2)若面膜層有凸起，此時推薦不采用此種開關。

It is a new type of electronic key operating system integrating key function, indicating element and instrument panel.

The membrane switch is composed of a panel, a sandwich glue, an upper circuit, a spacer layer, a lower circuit and a back glue layer. The contact point of the upper circuit deforms downward and contacts and conducts with the polar plate of the lower circuit. After the finger is released, the contact point of the upper circuit bounces back, the circuit is disconnected, and the loop triggers a signal. The membrane switch has rigorous structure, beautiful appearance and good sealing performance. It has the characteristics of moisture prevention and long service life. Widely used in electronic communication, electronic measuring instruments, industrial control, medical equipment, automobile industry, intelligent toys, household

There are a number of different forms and structures in the thin film switch device. The basic properties such as travel, operating force and mechanical life are mainly determined by the key type and material. Thin film switch includes single chip circuit switch and double circuit switch.

In general, the buttons on the film switch simply use color to express the position, shape, and size of the key. In this way, can only rely on the operator's visual to identify the operating accuracy, due to the lack of appropriate feedback information indicates that the fingers to the switch of the effective range of the switching action, thus affecting the confidence of the whole monitoring and operation speed. A key body is slightly raised, slightly higher than the panel, constitute a three-dimensional shape of the film switch, known as the three-dimensional key switch. Stereo key can not only accurately set the scope of the key body, improve the recognition speed, so that the operator's sense of touch is more sensitive, but also enhance the decorative effect of the product appearance.

The switch can be divided into three main tactile structures listed below:

Metal shrapnel keys:

Metal shrapnel button with metal shrapnel forming, disposed in the internal structure of the switch. Shrapnel with button connector for forming electric circuit.

Advantages: (1) this structure has a good sense of touch.

(2) the service life of high temperature is still very long.

Disadvantages: (1) when used in a soft panel, if the panel in the convex area of the panel may be damaged.

(2) the structure is best used for printed circuit boards or rigid panels.

Polyester buttons:

Polyester button is in the thin film switch circuit structure layer rolled convex keys, this structure is very durable, travel than metal shrapnel keys to some small. In some applications, polyester keys can be rolled into the mask layer, it can reduce the total number of membrane switch. The operating force of the key is related to the thickness of the material, the diameter of the key and the height of the button.

Advantages: (1) very durable

(2) millions of times can be used very well

No sense keys:

No touch switch is not touch, this operation panel usually uses other means to express the switch state of action.

Advantages: (1) long service life (can be used on a million).

(2) the effective area.

(3) in all the switches in the form of the lowest price Click to enlarge

Disadvantages: (1) no feel.

(2) if the mask layer is raised, this switch is not recommended at this time.