Epson PX-8 Technical Manual page 91

REV.-A
2.7.1 Key Switch Structure
A key switch made up of a key top and a switch as shown in Fig. 2-66. (A dust-proof switch cover
is inserted between the key top and switch of a function key.)
Inside of the switch section
Function key
Normal key
Fig. 2-66 Key Switch Structure
I
I
)---~
The.switch uses a pair of mechanical contacts. The spring contact moves left and right to make
and break contact according to the vertical stroke of the key stem. Fig. 2-67 illus-trates the rela-
tionship between make and break of the switch contacts and key stroke. The space, shift, and re-
torn keys have a press load of approximately 95g, while the rest have that of approximately 65g.
,.....::::;-- Full break area
~-
Make and break area
h'E~- Full make area
1.5
Fig. 2-67 Key Stroke And Switch Action
2-67