Various parameters and common sense of self locking light touch switch
Release time：2018-06-30 Clicks： Click
Self locking light touch switch is a kind of switch, which is not suitable for us to use. What are the principles of his application, which needs to be introduced in detail.
Recently, we have received the customers' self locking light touch switch, self locking button light touch switch and lock switch, and then teach you how to realize the self locking light touch switch through the circuit, the light touch switch of self locking button and the lock switch:
First of all, let's first understand what is self-locking tactile switch.
The self locking light touch switch is called the key switch, and the earliest appearance of the foreign known as: sensitive switch] pressure switch function closed and connected to the operating direction of the switch to meet the operating force. When the pressure is revoked, the switch is broken and its internal structure is connected by the change of the force of metal shrapnel.
The light touch switch is composed of inserts, pedestals, shrapnel, buttons and cover plates, wherein the waterproof type light touch switch adds a layer of polyimide film on the shrapnel.
The self locking light touch switch has the advantages of small contact resistance, accurate operating force error and variety of specifications. It has been widely used in electronic equipment and white household appliances, such as video and audio products, digital products, remote control, communication products, household appliances, security products, toys, computer products, fitness equipment, and so on. Medical equipment, banknote pen, laser pen button and so on. Because of the light touch switch to the environment conditions (the pressure less than 2 times the elastic / ambient temperature and humidity conditions and electrical performance) large equipment and high load button use conductive rubber or pan switch hardware shrapnel directly to replace, such as medical equipment, TV remote control and so on.
About the foot position of the five foot light touch switch: the two pins are a group, when the switch body is properly pressed, the four pins are turned on, and the fifth pins are grounded.
With the development of electronic technology, light touch switch is the fourth generation of switching products, the earliest volume is 12mmX12mm, 8mm and 8mm two, now 6mm is not 6om. The product structure has three kinds of vertical, horizontal and horizontal belt, and now there are two types of combination (3M, 4M, SM, 6M, SM) and the light touch switch of potentiometers to meet the requirements of all kinds of electronic products in China. Installation dimensions are 6.smm fire 4.5mm, 5.5mm and 4mm and 6mm and 4mm three kinds. There are 4.5mm and 4.5mm small touch switches and chip touch switches abroad. The chip touch switch is suitable for surface mounting. The current use of conductive rubber switches is also very popular
Now there are fifth generation switch thin film switches, which are the same as the light touch switch. They are mainly used for electronic and CNC machine tools, but the resistance is large and the handle is poor. In order to overcome the phenomenon of poor handle, it is also necessary to install contact springs on the membrane switch instead of using silver as the contact point.
Temperature use range of self locking light touch switch:
How to turn the click switch to switch with self locking function?
The circuit can turn the light switch into a self-locking light touch switch according to the diagram below.
Self locking light touch switch, lock touch switch, self lock switch working principle:
(1) when the power is on, the C9 charging, the C9 full of electricity, the base of the triode Q1, the cathode of the emitter to connect the battery power, the Q1 cut-off; the triode Q2 base ground, and the Q2 cut-off; thus the circuit is disconnected and VCC is 0V.
(2) when the light touch switch, C9 discharge, and C10 charge, because the C9 capacitor voltage can not be transient, the Q2 base voltage is instantaneously C9's capacitance voltage, that is, Q2 immediately enters the saturated conduction state, and C9 passes R18 discharge to make the Q2 collector voltage a saturation voltage, that is 0.3V, and the voltage of the C9 capacitance is also the voltage of the capacitance. It is also 0.7V; the battery power is divided by series voltage between R16 and R17, which makes Q1 saturable, so that the circuit is turned on, and the VCC is about the battery power supply voltage.
(3) when the light touch switch is pressed again, the be junction of Q2 is turned off because C9 is 0.3V and C10 is 0.7V, C9 charging and C10 discharge, and the battery power is charged by R18 to C9, which makes the Q1 base voltage rise, thus the Q1 cutoff.
The above is some common knowledge about self lock touch switch, mainly for your convenience, and I hope you can buy the right self lock touch switch.
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