Key switch device for combined key caps

Abstract

The invention relates to a key switch device for combined key caps. The key switch device comprises the key caps with characters, a reset body, a switch loop, a supporting board with a matching portion and scissors foot supports with upper and lower matching portions, wherein the scissors foot supports are in rotatable or sliding connection with the key caps and the supporting board through the upper and lower matching portions, force transmission between the scissors foot supports is carried out to form a synchronization linkage supporting structure to guarantee that the key caps do up and down lifting motion in a mode of be parallel with the supporting board, a matching portion of the key cap 1 comprises a key cap supporting matching portion, a buckle matching portion and a key cap anti-loosening portion, the key cap I comprises a key assembly I 33 and a key assembly II 35, the key assembly I 33 is fixedly connected with the key assembly II 35, the key assembly I 33 is arranged abovethe key assembly II 35, the key assembly II 35 is formed through stamping forming of a metal plate, the matching portion of the key cap 1 is arranged above the key assembly II 35, and a character isarranged above the key assembly I 33.

Description

[0001] Priority Statement: [0002] Claim 1 to claim 6 and claim 10 of the present invention, claiming the priority of the corresponding embodiment of the claim of the patent application for invention with the application number 2016108644627 submitted to the China National Intellectual Property Office on September 30, 2016; [0003] Claims 1 to 10 of the present invention require the priority of the invention patent application No. 2017103083067 submitted to the China National Intellectual Property Office on May 04, 2017, and the corresponding embodiments. technical field [0004] The present invention relates to a key switch device for performing keystroke operations, and more particularly to a key switch device incorporated in a keyboard as an input device of an electronic device. The invention also relates to a keyboard provided with a plurality of such key switch devices. Background technique [0005] see figure 1 , figure 2 The key structure device of existing keyb...

AI Technical Summary

Problems solved by technology

[0010] Problems existing in the plastic elastic limit structure: plastic elastic limit structures are set on the keycaps, see Figure 3 to Figure 7 . When installing the keycap, first install the keycap sliding part 3 on the upper sliding part of the scissors, and then rotate the keycap downward until the keycap rotating part 2 contacts the upper rotating part 10 of the scissors. During the pressing process, the keycap The two short and thick plastic elastic limit structures of the rotating part 2 need to produce a deformation of about 0.15mm on one side, and enter the matching space of the keycap rotating part 2 after deformation. The width B1 of the two short and thick plastic elastic limit structures is about It is 0.7mm, the length H1 is about 1.6mm, B1 / H1=0.4375, because the plastic is a plastic material, the short and thick plastic elastic limit structure has poor elasticity, low strength, and the limit interference is small. The thinner it is, the two short and thick plastic elastic limit structures (H1 size) of the keycap rotating part 2 limit the design of the low height of the keycap. At the same time, due to the influence of injection molding defects and the two short and thick The mold with plastic elastic limit structure needs oblique drawing structure, etc.

As a result, the two short and thick plastic elastic limit structures of the keycap rotating part 2 have a high defect rate at the factory and during use.

[0011] 1. After the keycaps of the notebook keyboard leave the factory, the problem of the keycap falling off is very prominent. The problem of keydropping is the most prominent and urgent problem of the notebook keyboard at present; the short and thick plastic elastic limit structure of the keycap of the notebook keyboard has been coordinated The margin is 0.15mm on one side. When the fit interference is too small, the key drop phenomenon is likely to occur; when the fit interference is too large, the two short and thick plastic elastic limiters on the keycap rotating part 2 are prone to occur. Hidden dangers of structural fracture failure and buried fracture failure

Two short and thick plastic elastic limit structures have poor elasticity and low strength;

[0012] 2. Thinning the keycap will inevitably shorten it--short and thick plastic elastic limit structure, the short and thick plastic elastic limit structure is shortened, resulting in the lower limit of the elasticity of the short and thick plastic elastic limit structure, which limits the further lower height of the keycap design

[0018] 1. The matching part of the plastic keycap has an undercut structure. The underturn structure of the keycap requires 4 core-pulling mechanisms on the side of the mold. The mold structure is very complicated, resulting in a complex and large mold structure. A pair of molds has 64 keycaps Arrangement design, a total of 64*4 side core-pulling mechanisms;

[0019] 2. Plastic keycaps are affected by injection molding defects, especially the matching parts with small structures, which are prone to injection molding defects;

[0020] 3. The precision of injection molding is lower than the stamping precision of sheet metal, precision injection molding -- the tolerance of small-sized structural injection molded parts is 0.08mm (GB / T14486-2008), linear dimension stamping --- the stamping accuracy of sheet metal is 0.026mm (GB / T 13914- 92), the stamping and bending accuracy of thin plates is 0.5 degrees (GB / T 13915-2002);

[0021] Compared with the sheet metal scissors support, the commonly used plastic scissors support has poor strength, poor stiffness, and poor precision, and there are injection defects in injection molding production, which cannot further reduce the height of the keyboard. The production efficiency of the scissors support is much lower The production efficiency is lower than that of the stepping die (the difference in production efficiency is 92 times - 184 times); although the sheet metal scissor foot support has the advantages of high strength, high rigidity, super high production efficiency, and low production equipment cost, etc.

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