Touch Key Production Test Tools

Touch Key Production Test Tools
Touch Key Production Test Tools
Introduction
Customers often ask questions with regard to production testing. Difficulties arise in
testing as touch switch operation and sensitiviy is a subjective subject. One reason is due
to the fact that human fingers have different dimensions.
After some consideration a recmmended approach is to use a copper or brass cylinder
instead of human finger contact which after experimental data sampling, produced the
following sensitivity results.
Steps
1. Use a 9mm diameter copper or brass cylinder covered with conductive rubber at the
contact end in order to fix a contact test point and use this to test the touch terminal
sensitivity.
2. This is an objective test method. If the test passes, it indicates sufficient touch key
sensitivity.
3. The engineering test will be more rigorous than the production line test. In addition to
using a 9mm diameter copper cylinder to test, a test should be conducted using a 5mm
cylinder.
☆ Use a 9mm diameter copper or brass cylinder to test the touch key minimum
sensitivity. If the copper cylinder is effective, then finger contact will also be
effective, however it might be over-sensitive. Use a 5mm diameter copper or brass
cylinder to test the touch key maximum sensitivity. If, when using a 5mm diameter
cylinder instead of finger contact, the key is not effective, then the key may be too
sensitive.
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Touch Key Production Test Tools
※ Cylinder specifications: material is brass,length is 120 mm, diameter is 9mm and
5mm,conductive rubber pad is H 2mm.
The cylinder specifications mentioned above have been obtained from multiple human
body sampling and actual test results.
Keep the cylinder conductive rubber cap parallel to the touch keys during operation to
ensure good touch key contact.
Reference Data
Appendix: Touch key test results
Body Thickness 1.6mm
Press Lightly
Press Heavly
35
46
17
35
32
41
31
44
16
36
22
35
31
40
22
43
Copper Cylinder
9mm
5mm
31
15
38
13
31
13
31
13
32
12
30
12
26
11
25
12
Note:The above table data is measured using the EasyTouch Tool.
2
Tester
Alvin
JK
Viky
Patrick
Daniel
Mei
Jordan
Shi’R