A weighing instrument membrane key switch and its antistatic layer manufacturing method
An anti-static layer and a technology for its production method are applied in the direction of electric switches, layers, circuits, etc., which can solve problems such as anti-static interference, difficulty in shielding and anti-static, and misoperation of keys, so as to reduce manufacturing costs, increase anti-static performance, The effect of satisfying the display effect
Active Publication Date: 2018-09-11
广东德怡电子科技有限公司
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Problems solved by technology
When the traditional membrane key switch is used as the operation panel, due to some defects of the membrane key switch, one of them has a large number of gaps, which brings great difficulties to the shielding and anti-static of electronic products, and the circuit and components of the second switch part Devices are susceptible to interference from radio frequency and static electricity, resulting in misoperation of key operations
Third, shielding cannot be performed on the displayed transparent window
If this type of membrane switch is to be directly applied to weighing instruments, anti-static interference is a difficult problem
Method used
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Embodiment 1
[0033] See figure 1 and figure 2 , a membrane key switch for a weighing instrument in this embodiment is composed of a printed circuit board 1 and a membrane key panel 2 covering the printed circuit board 1; the printed circuit board 1 is sequentially ground layer 11, power layer 12 and several signal layers 13. The thin film button panel 2 is as follows from top to bottom: first protective layer 21, antistatic layer 22, PET substrate 23, pattern layer 24, second protective layer 25, conductive adhesive layer 26 and key pad layer 27; Layer 21, antistatic layer 22, PET substrate 23, pattern layer 24, second protective layer 25 and conductive adhesive layer 26 are provided with a transparent window 28; antistatic layer 22, PET substrate 23, pattern layer 24, second protective layer 25 and the conductive adhesive layer 26 are provided with at least one process via 29 to connect the antistatic layer 22 and the conductive adhesive layer 26; the antistatic layer 22 is a transpare...
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The invention discloses a weighing meter thin film keypad switch and a manufacturing method of an antistatic layer of the switch. The switch is composed of a printed circuit board and a thin film keypad panel covering the printed circuit board; the printed circuit board is provided with a ground wire layer, a power source layer and multiple signal layers from bottom to top in sequence; an ESD static impeder is connected between the ground wire layer and the multiple signal layers; the thin film keypad panel is provided with a first protective layer, the antistatic layer, a PET substrate, a pattern layer, a second protective layer, a conductive rubber layer and a keypad cushion layer from bottom to top in sequence; the ground wire layer of the printed circuit board is connected to the antistatic layer of the thin film keypad panel. According to the weighing meter thin film keypad switch and the manufacturing method of the antistatic layer of the switch, by adopting the mode that the ESD static impeder is parallelly connected between signal lines and the ground wire, the phenomenon of static generated due to a touch effect is avoided, and thus the protective keypad thin film switch itself is protected.
Description
technical field [0001] The invention relates to a membrane key switch of a weighing instrument and a method for manufacturing the antistatic layer thereof. Background technique [0002] Due to the high requirements on the appearance of the intelligent weighing instrument, the membrane key switch with the window is often used as the operation carrier in the design, which not only brings convenient operation and beautiful appearance, but also encounters the problem of anti-static interference, especially the weighing The instrument has extremely high requirements on display degree and display stability. When the traditional membrane key switch is used as the operation panel, due to some defects of the membrane key switch, one of them has a large number of gaps, which brings great difficulties to the shielding and anti-static of electronic products, and the circuit and components of the second switch part Devices are susceptible to interference from radio frequency and static ...
Claims
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IPC IPC(8): H01H13/704H01H11/00
CPCH01H11/00H01H13/704H01H2209/082H01H2229/002H01H2239/008
Inventor 黄宇航王烨青李亮亮
Owner 广东德怡电子科技有限公司