Silica film all-in-one keyboard

Abstract

The invention relates to a silica film all-in-one keyboard which comprises a face plate layer, a lower substrate layer with a film circuit, an upper substrate layer with electric conduction wafers and an insulation interlayer. The face plate layer comprises a polyester film layer and a silica gel layer below the polyester film layer, the polyester film layer is connected with the silica gel layer in a hot-press mode, a plurality of upwards-plump keys on the polyester film layer are connected with corresponding upwards-plump keys on the silica gel layer, the plump heights H of the keys on the polyester film layer are 0.5-1.0mm, the lower portion of the silica gel layer is connected with a sealing gasket layer through a peelable glue layer, the sealing gasket layer is fixedly connected with the upper substrate layer, the upper substrate layer is fixedly connected with the lower substrate layer through the insulation interlayer, protrusions corresponding to the keys on the polyester film layer are arranged on the upper substrate layer, and the electric conduction wafers at the bottoms of the protrusions correspond to electric conduction strips on the film circuit. The silica film all-in-one keyboard is simple and reasonable in structure, capable of improving the hand feeling of the keyboard and small in pressing force, reduces labor intensity, brings convenience to replacement of the face plate layer, and reduces use cost of the keyboard.

Description

technical field [0001] The invention relates to a silicone membrane integrated keyboard, which belongs to the technical field of membrane keyboards. Background technique [0002] Most of the current operating systems of industrial instruments use a membrane keyboard that integrates decoration and functionality. This membrane keyboard has a better life and reliability. The existing membrane keyboard is composed of a panel layer composed of an upper polyester film sheet and a lower upper substrate layer and a lower substrate layer for the control circuit. The upper substrate layer is also made of polyester film, and its lower part is equipped with a patch switch with a stroke of about 0.3mm. By pressing the button on the panel layer, the patch switch is controlled to be turned on and off with the lower film circuit. Realize the switch on or off of the membrane keyboard. Since the diagonal length of the keys of the industrial membrane keyboard or the diameter of the circular ...

AI Technical Summary

Problems solved by technology

Therefore, some users often use other tools instead of fingers to operate the keyboard after operating for a period of time, and even use some sharp objects such as ballpoint pens to operate the keyboard, so the upper panel layer of the membrane keyboard is often damaged, and then the lower circuit part is damaged. It is one of the main causes of membrane keyboard damage

Another type of membrane keyboard used for industrial instruments is the reed membrane keyboard. Although the feel of this membrane key will be improved during operation, the pressing force of the button also needs to be above 300g, and the service life of the reed It is usually designed within 500,000 times, so the service life of the membrane keyboard with this structure is greatly reduced in industrial occasions

Furthermore, the bottom of the membrane keyboard is reliably connected to the stainless steel front cover with 3M glue to ensure the sealing performance of the instrument. However, because the panel layer on the membrane keyboard is easily damaged, when replacing it, the entire membrane keyboard needs to be peeled off from the stainless steel front cover and removed. Remove it, and then glue the new membrane keyboard on the stainless steel front cover. On the one hand, it is very difficult to peel off the membrane keyboard from the stainless steel shell, and the circuit control part of the lower part of the membrane keyboard is connected to the circuit part inside the instrument, so the service personnel need to After removing all the components on the front cover, remove the circuit wiring of the membrane keyboard and the circuit wiring inside the shell, and then reconnect the circuit of the membrane keyboard and the internal circuit. Due to the heavy workload of assembly and disassembly, the operation is inconvenient and costly. Labor costs, and the on-site replacement of the membrane keyboard is not easy to ensure the sealing of the instrument, which reduces the reliability of the instrument

On the other hand, due to the short service life of the panel layer, and the design of the lower upper and lower substrate layers with a longer service life, the overall replacement of the membrane keyboard increases the use cost of the instrument

Images