The keys on the membrane keyboard use different colors to indicate the position, shape and size of the key body, which is more common in the initial stage of the membrane keyboard. Three-dimensional membrane keyboard: Usually, the keys on the membrane keyboard only use colors to express the position, shape and size of the key body. In this way, the accuracy of the operation can only be recognized by the operator's vision. Since there is no appropriate feedback information to indicate whether the finger is pressed in the effective range of the switch to make the switch act, it affects the confidence in the monitoring of the whole machine and the speed of operation. A kind of membrane keyboard that makes the switch key body slightly protrude, slightly higher than the panel to form a three-dimensional shape, is called a three-dimensional key switch. The three-dimensional key can not only accurately specify the range of the key body, improve the recognition speed, make the operator's touch more sensitive, but also enhance the decorative effect of the product appearance. The production of the three-dimensional key must be done in the design stage of the panel Arrangement, with process holes, in order to have accurate positioning when the mold is pressed, the height of the three-dimensional protrusions generally should not exceed twice the thickness of the substrate. In order to make the appearance of the product beautiful, the protrusion of the raised membrane keyboard can have various changes.
