POLY DOME (Card position assembly)：
Through the positioning hole and silica gel column positioning, no need to paste, cheap!When the key is pressed, the contact center is concave. The conductive paste printed on the contact contacts with the circuit on the PCB, thus forming a circuit, so that the whole product can work normally.
PET+SPACER+ (Single-sided adhesive) + conductive point:
1. DOME(PET)
2.(Spacer)
3. (Conductive point)
Product parameters:
1. Adhesive:
(mm) thichness | initial force | retentivity(hr/kg*inch) | adhesive force(kgf/inch) | |
Rubber material/project | ||||
Transparent/white one side glue ·
| thickness of adhesive：0.035~0.05 | The adhesive rolling distance of corresponding steel balls is less than 10cm ·
| 8↑ | 0.6↑ |
2.Conductive point: carbon silver, first printed silver paste in the printed carbon paste, thickness: 0.008~0.012.Advantages: strong antioxidant, not easy to scratch.
Carbon silver | resistance |
<10Ω |
3.Product parameters
KEY point diameter(mm) | FORCE(g) | CLICK(%) | springbackFR(g) | STROKE(mm) | LIFE | Environmental testing conditions | |
DOME | |||||||
0.1PET | Φ4.5~5.0 | 100~180 | 45~75 | >25 | 0.3~0.45 | 30 | 70℃85%RH48hrs |
0.125PET | Φ5.5~6.0 | 160~260 | 45~75 | >30 | 0.4~0.55 | 50 | 70℃85%RH48hrs |
4. Tolerance requirements:
project | positioning hole to positioning hole(mm) | Positioning hole to shape(mm) | Shape to shape(mm) | Hole diameter(mm) | Positioning hole to key(mm) |
/sample | |||||
Manual sample | ±0.15 | ±0.15 | ±0.15 | ±0.1 | ±0.15 |
Mould sample | ±0.1 | ±0.1 | ±0.1 | +0.08/-0 | ±0.1 |
Note: (1) the positioning hole are minimum aperture Φ 1.0 mm;
(2) the distance between the inner side of the two key points shall be greater than 1.0mm;
(3) The hole edge of the mechanism should be greater than 1.0mm from the key point;
(4) The minimum diameter of the hole of the SP piece is greater than 0.4mm than the diameter of the key point.
5. The sample delivery：
The new model(50~100pcs) | The old model(50~100pcs) | |
Manual sample | 3 ~ 4 working days | 2 ~ 3 working days |
Mould sample | 1 working day after the mold returns | 2 ~ 3 working days |
Mold delivery time: a. forming mold 3-4 working days
B. 6-7 working days for steel mold
Note: 1. The conditions for the life test are as follows: the silicone flat head of the hitting head;Diameter: Φ 1.5;Speed: 2~3 times/second;Strike power: 400-500g.
2. Life determination: a. Before and after life hitting, the rate of change of elasticity and feel of DOME is less than 30%;B. No ink shedding, no KEY point cracking.
